Replace Set*Callback with TransitionToAccessorPair

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 0425889fb88d8bf2da4147d1d5211c38e429e532..50772bafc201ff56afd53d3eeae033153f5d4173 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2310,16 +2310,6 @@ class JSObject: public JSReceiver {
                                     ElementsKind kind,
                                     Object* object);
 
-  static bool CanSetCallback(Handle<JSObject> object, Handle<Name> name);
-  static void SetElementCallback(Handle<JSObject> object,
-                                 uint32_t index,
-                                 Handle<Object> structure,
-                                 PropertyAttributes attributes);
-  static void SetPropertyCallback(Handle<JSObject> object,
-                                  Handle<Name> name,
-                                  Handle<Object> structure,
-                                  PropertyAttributes attributes);
-
   // Return the hash table backing store or the inline stored identity hash,
   // whatever is found.
   MUST_USE_RESULT Object* GetHiddenPropertiesHashTable();